Unit 1: Biology and Disease

Created by: Amber
Created on: 13-12-12 18:07

TEM

Transmission Electron Microscope: Uses electromagnets to focus a beam of electrons. Denser parts absorb more electrons & therefor look darker. High resolution image.

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SEM

Scanning Electron Microscope: Reflected electrons are gathered in a cathode ray tube, shown on TV image. Show surface of specimen and can be 3D.

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Prokaryotes

Bacteria & Blue-green algae.

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Eukaryoes

Animal and Plant cells.

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Cell Wall

Supports plant cells: rigid structure surrounds plant cells - made up of cellulose.

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Lysosome

Round oranelle surrounded by membrane. Contains digestive enzymes.

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Ribosome

V.Small organelle. Site where proteins are made.

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Smooth Endoplasmic Reticulum

Transports lipids around the cell

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Rough Endoplasmic Reticulum

Transports proteins which have been made in the ribosomes.

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Golgi Apparatus

Group of smooth Endoplasmic Reticulum. Vesicles often seen @ edges. it packages substances that are produced by the cell. Mainly proteins & glycoproteins. Also makes lysosomes

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Vesicle

Small fluid-filled sac in cytoplasm, Transports substances toand from cll via plasma membrane.

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Mitochondrion

Normally oval. Double membrane. Inner one is folded to form cristae. Inside is matrix - contains enzyme involved in respiration. ATP produced.

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Chloroplast

Small flattened structure found in plant cells. Double membrane & thylakoid membrane inside. Stacked up to form grana - linked together by lamellae. Photosynthesis takes place.

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